where visibility be is slightly reduced. 2 miles of visibility at half moon bay, same thing in santa rosa. we're going to see this get worse through the overnight hours leading to delays at sfo into tomorrow morning. and we go live to jeff bush now who's out there with more on the flight delays. >> reporter: i just got off the phone with the airport duty manager, and she just told me we're experiencing delays here at sfo of 30-90 minutes. and you can see that about half of all arrivals are affected. and that is the arrivals that are mostly affected. the reason that this happens is because when the fog comes around, they have to slow down the traffic of the airplanes. so they basically reduce about half of the arrivals to make it safe. jeff bush, live at sfo, kron4 news. >>> one family on san francisco's russian hill was startled awake when a 45-ton cypress tree uprooted and fell, crashing into their home. >> well, what happened was, at first it was just a huge explosion, and i thought it was an earthquake. and so i said it's okay! it was just an earthquake. and my son was in his room, and